As for eBay shots and jewelry in particular, know that jewelry is difficult to photograph and you will need a small light tent or suitable set to keep metal reflections from ruining the images. I have seen "pro" eBay photographers try to do jewelry and wind up in a mess.  You have to have diffused light or the highlights blow out.

Also, an important aspect of auction shots, like eBay, is that the image be very true to the item for sale.  Do not make the image better than the actual item.  You can get away with having it look slightly worse(still good of course).   Nothing infuriates a "winner" more than having something come in the standard priority mail and look worse than the photos they saw.  If the item looks better, they are thrilled!   If you can get the shots just like the original item, great, otherwise, do not spend a lot of time sprucing up the shot since that will possibly disappoint the bidders who do purchase the items.

These auction photographers seem to have a fairly good little business going and it is worth looking at as an option.         Tom.      btw, glad to meet you.